/Engine/Source/Runtime/Core/Public/Serialization/BufferWriter.h
Similar toFMemoryWriter, but able to internally manage the memory for the buffer.
class FBufferWriter : public [FArchive](API\Runtime\Core\Serialization\FArchive)
bool
bAllowResize
bool
bFreeOnClose
void *
WriterData
int64
WriterPos
int64
WriterSize